RTF malware analysis — malicious · 527ed609f6773c28

MALICIOUS

RTF

41.0 KB First seen: 2023-02-06

MD5: c9368057a32b40f6ed2f946bcea843f6 SHA-1: 9b78d03d9893943282e870d42502436c89f8d2fd SHA-256: 527ed609f6773c285da97b979a137703b8ccb069a738a7bd341517b6fe292986

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter

The RTF document contains an embedded OLE object with a split Equation Editor ProgID, indicating an attempt to exploit the Equation Editor vulnerability. The presence of \objupdate and a lure to 'Enable editing' suggests the document is designed to trick the user into activating the exploit. The embedded OLE object, objdata_00_off000055ac.bin, is likely the malicious payload or a component thereof.

Heuristics 4

Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR

RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
\objupdate forces OLE activation high RTF_OBJUPDATE

RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
OLE object data medium RTF_OBJDATA

RTF contains 1 \objdata section(s) — embedded OLE objects
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`objdata_00_off000055ac.bin` `45836882be82fc2b74b0a9d3b2b74f370e1c3a4f4fde038c2d497caf937bf05f`	rtf-objdata-decoded	RTF \objdata at offset 0x55AC	1924 bytes

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